Improvement in balanced valves



UNITED STATEs PATENT OFFICE.

FRANK P. OADY, OF CLEVELAND, OHIO, ASSIGNOR OF ONE-HALF HIS RIGHT TOSETH M. OADY, OF SAME PLACE.

I IMPROVEMENT IN BALANCED VALVES.

Specification forming part of Letters Patent No. 138,992, dated May 20,1873', application filed February 21, 1873.

To all whom it may concern Be it known that I, FRANK P. OADY, ofCleveland, in the county of Guyahoga and State of Ohio, have invented acertain new and Improved Steam Balance-Valve; and I do hereby declarethat the following is a full, clear, and complete description thereof,reference being had to the accompanying drawing making part of the same.

Figure l is a plan view of the valve and inside of the steam-chest. Fig.2 is a side view of the valve and inside of the steam-chest. Fig. 3 is atransverse vertical section thereof.

Like letters of reference refer to like parts in the several views.

The object sought for in this invention is to release the valve from thedirect pressure of steam upon it in one direction, by causing an equalpressure of the steam to be exerted upon it in the opposite direction,thereby placing the valve in equilibrium so far as regards thesteam-pressure, making of the valve a balanced one, as hereinafter morefully described.

In the drawing, A represents an ordinary steam-chest, of which E is theseat, 0 the valve, and D the valve-rod. To the top of the valve issecured a disk, E, Fig. 2, having a central core or boss, F, Fig. 3.Around said boss is fitted looselya ring, G, the lower side of whichfits close around the boss, Whereas the upper side is rabbeted out,forming an annular recess, in which are closely but loosely fitted tworings, a b, Fig. 3, one above the other, as shown. The upper surface ofthe ring G and the surface of the ring a are flush, one with the other,and both of which are a little above the face of the core or boss,forming a recess or chamber, 0, about equal to the chamber in the valve.Betweenthe ring G and the face of the disk E are interposed springs H,Fig. 2, the purpose of which is to keep the surface of the rings inclose contact with the under side of the cover I of the chest, which ismade true and smooth for that purpose, and with which it forms a close,tight joint.

The practical operation of the above-described steam-valve is asfollows: It will be obvious, on examination of the drawing, that thesteam will not only press down upon the surface of the valve, but alsoupward against the under side of the disk E; therefore, in consequenceof the said valve being attached to the valve in a rigid manner, thetendency of this upward exertion of the steam will be to counterbalanceits downward pressure exerted on the valve, and, as the surface of thedisk is about equal to that of the valve, the valve will be equallybalanced, and hence it will be easily operated, requiring only so muchpower as to move the weight thereof without the resistance consequent ofsteampressure.

To prevent the steam from getting between the surfaces of the rings Gand a and that of the'cover of the chest is the purpose of the springsH, the resiliency of which keeps the rings in close contact with thesurface of the cover. The rings are also made to fit steam-tight aroundthe boss, and for that purpose the wings are cut and sprung on aroundthe boss.

Claim.

purpose set forth.

FRANK P; OADY. Witnesses:

J. H. BURRIDGE, A. F. CORNELL.

